CN203466822U - Circuit used for cable leakage detection and cable leakage detection system - Google Patents
Circuit used for cable leakage detection and cable leakage detection system Download PDFInfo
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- CN203466822U CN203466822U CN201320506779.5U CN201320506779U CN203466822U CN 203466822 U CN203466822 U CN 203466822U CN 201320506779 U CN201320506779 U CN 201320506779U CN 203466822 U CN203466822 U CN 203466822U
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- 230000002457 bidirectional effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
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Abstract
The utility model discloses a circuit used for cable leakage detection and a cable leakage detection system. The circuit comprises a first signal generator generating a first frequency signal, a first directional coupler and a second directional coupler. The first directional coupler receives a second frequency signal generated by a far-end machine. The first directional coupler couples the first frequency signal and the second frequency signal and then sends the signal to the second directional coupler. The second directional coupler sends out the coupling signal which is from the first directional coupler through a receiving and sending port, receives a returned echo signal through the receiving and sending port and sends the echo signal to a processor of a network management center so that detection is performed. By using the circuit and the system of the utility model, when a communication signal is not added or a base station signal can not be detected, the echo signal can be detected. The detection system does not need to be equipped with extra acquisition equipment. The circuit and the system can be directly added in the far-end machine in the prior art.
Description
Technical Field
The utility model belongs to railway signal check out test set field especially relates to a leak cable detection circuitry and leak cable detecting system.
Background
Railway signal transmission in the tunnel needs to depend on a leakage cable, through deep research, the faults of the leakage cable, an antenna feeder line and other passive components account for more than 50% of the problems of the whole radio frequency wireless system, and the performance of the leakage cable has important influence on the safe transmission of the railway signal.
In the existing similar equipment, a CGI-GR-VSWR-M detection module adopts a mode of directly detecting the standing wave ratio of a communication signal for detection, namely a coupler is used for collecting a signal from a downlink signal of a repeater and calculating the standing wave ratio of the signal to determine the state of a leaky cable. The disadvantage of this method is that the echo signal cannot be detected once no communication signal is added or no base station signal is detected, and the detection module needs to be additionally equipped with an acquisition device.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a leaky cable detection circuit and a leaky cable detection system, so as to solve the problem that the echo signal cannot be detected when the communication signal is not added or the base station signal cannot be detected in the prior art.
In order to solve the above problem, the utility model provides a leaky cable detection circuit, include:
a first signal generator and first and second directional couplers that generate a first frequency signal;
wherein,
the first directional coupler receives a second frequency signal generated by a remote terminal;
the first directional coupler couples the first frequency signal and the second frequency signal and then sends the coupled signals to the second directional coupler;
the second directional coupler sends out the coupling signal from the first directional coupler through a transceiving port, receives a returned echo signal through the transceiving port, and sends the echo signal to a processor of a network management center for detection.
The first signal generator is realized in a single chip microcomputer.
Further, the device also comprises a first signal transceiving chip which is connected in series between the singlechip and the first directional coupler;
and a first frequency signal generated by the singlechip is sent to the first directional coupler through the first signal transceiving chip.
Further, the system also comprises a second signal transceiving chip which is connected in series between the singlechip and the second directional coupler; the second directional coupler sends the echo signal sent to the processor of the network management center to the singlechip through the second signal transceiver chip, and then the echo signal is sent to the processor of the network management center by the singlechip for detection.
Wherein the first frequency signal is 868 MHz; the second frequency signal is 930 MHz.
The utility model also discloses a leaky cable detecting system, include: the leaky cable detection circuit and the remote terminal;
and the far-end machine receives the echo signal sent to the processor of the network management center by the single chip microcomputer, and then sends the echo signal to the processor of the network management center for processing.
Further, still include: a leaky cable;
the leaky cable receives the coupling signal transmitted by the second directional coupler and generates the echo signal to return to the second directional coupler.
The second directional coupler and the drain cable are in signal transmission through 1/2 feeder lines.
The remote terminal sends a second frequency signal to the first coupler through 1/2 feed line;
the processor of the network management center is provided with signal data processing software;
and the processor of the remote machine and the processor of the network management center transmit the echo signal through a wireless network.
The utility model provides a leaky cable detection circuitry and leaky cable detecting system has following advantage:
1. the echo signal can be detected in any case by providing a detection signal by a leaky cable detection circuit.
2. The system is directly connected to the existing remote machine, and no acquisition equipment is required to be additionally equipped.
Drawings
FIG. 1 is a block diagram of a circuit configuration for leaky cable detection;
FIG. 2 is a schematic diagram of a circuit for leaky cable detection;
fig. 3 is a schematic structural block diagram of a leaky cable detection system.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include logical, logical order, and other changes. The examples merely typify possible variations. Individual steps and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
As shown in FIG. 1, the utility model provides a be used for leaky cable detection circuitry 2, include
A first signal generator and first and second directional couplers U1 and U2 that generate a first frequency signal;
the first directional coupler U1 and the second directional coupler U2 each include four ports, which are an input port, a through port, a coupled port, and an isolated port.
The output end of the first signal generator is connected with the input end of the first directional coupler U1, and the coupling end of the first directional coupler U1 is connected with the isolation end of the second directional coupler U2;
the isolation termination of the first directional coupler U1 terminates the second frequency signal generated by the remote 2;
the coupling end of the second directional coupler U2 is connected with the leaky cable 3;
the outputs of the first directional coupler U1 and the second directional coupler U2 are grounded.
Through the structure, the first directional coupler U1 couples the first frequency signal and the second frequency signal and then sends the coupled signals to the second directional coupler U2;
the second directional coupler U2 transmits the coupling signal from the coupling end of the first directional coupler U1 to the leaky cable 3 connected to the coupling end of the second directional coupler U2, receives the return echo signal through the coupling end, and transmits the echo signal to the processor of the network management center for detection.
Further, the leakage cable detection circuit 2 comprises a single chip microcomputer U4, a first signal transceiving chip U6 and a second signal transceiving chip U5;
the first signal generator is realized in the single chip microcomputer U4, and the single chip microcomputer U4 provides a plurality of bidirectional I/O ports as a first frequency output end;
the input end of the first signal transceiving chip U6 is connected with the first frequency signal output end of the singlechip U4, and the output end of the first signal transceiving chip U6 is connected with the input end of the first directional coupler U1;
the singlechip U4 provides a plurality of bidirectional I/O ports as echo signal input ends;
the input end of the second signal transceiving chip U5 is connected with the input end of the second directional coupler U2, and the output end of the first signal transceiving chip U6 is connected with the echo signal input end of the singlechip U4.
Through the structure, the first frequency signal generated by the singlechip U4 is sent to the first directional coupler U1 through the first signal transceiving chip U6.
The second directional coupler U2 sends the echo signal sent to the processor of the network management center to the single chip microcomputer U4 through the second signal transceiving chip U5, and then the single chip microcomputer U4 sends the echo signal to the processor of the network management center through the remote terminal 2 for detection.
Further, the leaky cable detection circuit 2 further comprises: a first filter Z1 and a second filter Z2;
the first filter Z1 is connected in series between the first signal transceiving chip U6 and the first directional coupler U1;
the second filter Z2 is connected in series between the second signal transceiving chip U5 and the second directional coupler U2;
further, for the leaky cable detecting circuit 1, as shown in fig. 2, the ports with the same labels are connected, and the leaky cable detecting circuit further includes: the circuit comprises a crystal oscillator circuit, a reset circuit and a power supply conversion circuit;
the crystal oscillator circuit is connected with a crystal oscillator port of the single chip microcomputer U4;
the reset circuit is connected with a reset port of the single chip microcomputer U4;
the power conversion circuit comprises a first voltage conversion chip U8 and a second voltage conversion chip U7;
the input end of the first voltage conversion chip U8 is used as the input end of the power conversion circuit and is used for receiving +12V voltage;
the output end of the first voltage conversion chip U8 is connected with the input end of the second voltage conversion chip U7;
the output end of the first voltage conversion chip U8 and the output end of the second voltage conversion chip U7 are respectively used as the output ends of the power conversion circuit.
At least one capacitor is arranged at each connection in the power conversion circuit.
The first voltage conversion chip U8 converts the input +12V voltage into +5V working voltage, the second voltage conversion chip U7 converts the +5V voltage into +3.3V working voltage, and the +3.3V voltage output end and the +5V voltage output end are respectively connected to the working power supply input ends of the chips in the leaky cable detection circuit 2.
A capacitor C is connected in series between the first directional coupler U1 and the first filter Z1
4, a capacitor C7 is connected in series between the first filter Z1 and the first transceiver chip connection, a capacitor C3 is connected in series between the second directional coupler U2 and the second filter Z2, and a capacitor C6 is connected in series between the second filter Z2 and the second transceiver chip connection;
the isolated end of the first directional coupler U1 is connected in series with a capacitor C1; the coupling end of the second directional coupler U2 is connected in series with a capacitor C2;
the first frequency signal is 868MHz, and the second frequency signal is 930 MHz.
As shown in fig. 3, the present invention further provides a leaky cable detecting system, which includes the above-mentioned leaky cable detecting circuit 2 and the remote terminal 1 for generating the second frequency;
the singlechip U4 provides a plurality of bidirectional I/O ports as echo signal output ends;
the remote machine 1 is connected with an echo signal output end of a single chip microcomputer U4 in the leaky cable detection circuit 2;
the remote machine 1 is connected with the isolated end of a first directional coupler U1 in the leaky cable detection circuit 2;
the remote machine 1 is connected with the input end of a power supply conversion circuit in the leaky cable detection circuit 2;
through the above connection structure, the remote 1 provides the second frequency signal to the first directional coupler U1, and provides the input voltage for the power conversion circuit U6.
The far-end machine 1 receives the echo signal from the single chip microcomputer U4, and the far-end machine 1 sends the echo signal to a processor of a network management center for processing.
Further, this leaky coaxial cable detecting system still includes: a leaky cable 3;
the leakage cable 3 is connected with a coupling end of a second directional coupling U2 in the leakage cable detection circuit 2;
with the above configuration, the leaky cable 3 receives the coupling signal transmitted from the second directional coupler U2, and generates an echo signal to return to the second directional coupler U2.
The second directional coupler U2 and the leaky cable 3 perform signal transmission through the 1/2 feeder 4.
The remote 1 transmits a second frequency signal to the first coupler U1 through 1/2 feed line 4;
the processor of the network management center is provided with signal data processing software;
the remote machine 1 and the processor of the network management center transmit the echo signal through a wireless network.
The leaky cable detection circuit 2 and the leaky cable detection system are both used for detecting leaky cables in a GSM-R system.
Any modifications, equivalent substitutions, improvements and the like made to the processes described in the embodiments of the present invention within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (10)
1. A circuit for leaky cable detection, comprising;
a first signal generator and first and second directional couplers that generate a first frequency signal; wherein,
the first directional coupler receives a second frequency signal generated by a remote terminal;
the first directional coupler couples the first frequency signal and the second frequency signal and then sends the coupled signals to the second directional coupler;
the second directional coupler sends out the coupling signal from the first directional coupler through a transceiving port, receives a returned echo signal through the transceiving port, and sends the echo signal to a processor of a network management center for detection.
2. A circuit for leaky cable detection as claimed in claim 1, wherein said first signal generator is implemented in a single chip microcomputer.
3. The circuit for leaky cable detection as claimed in claim 2, further comprising a first signal transceiver chip connected in series between said single chip microcomputer and said first directional coupler;
and a first frequency signal generated by the singlechip is sent to the first directional coupler through the first signal transceiving chip.
4. The circuit for leaky cable detection as claimed in claim 3, further comprising a second signal transceiver chip connected in series between said single chip microcomputer and said second directional coupler; the second directional coupler sends the echo signal sent to the processor of the network management center to the singlechip through the second signal transceiver chip, and then the echo signal is sent to the processor of the network management center by the singlechip for detection.
5. A circuit for leaky cable detection as claimed in any of claims 1 to 4, wherein said first frequency signal is 868 MHz;
the second frequency signal is 930 MHz.
6. A leaky cable detection system, comprising: a circuit for leaky cable detection and a remote machine as claimed in any one of claims 1 to 4;
and the far-end machine receives the echo signal sent to the processor of the network management center by the single chip microcomputer, and then sends the echo signal to the processor of the network management center for processing.
7. The missing cable detection system as claimed in claim 6, further comprising: a leaky cable;
the leaky cable receives the coupling signal transmitted by the second directional coupler and generates the echo signal to return to the second directional coupler.
8. The leaky cable detection system as claimed in claim 7, wherein said second directional coupler and said leaky cable are in signal communication via 1/2 feeder lines.
9. The leaky cable detection system as claimed in claim 8, wherein said remote terminal transmits a second frequency signal to said first directional coupler through an 1/2 feed line;
10. the missing cable detection system as claimed in claim 9, wherein the processor of the network management center is provided with signal data processing software;
and the processor of the remote machine and the processor of the network management center transmit the echo signal through a wireless network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506779.5U CN203466822U (en) | 2013-08-19 | 2013-08-19 | Circuit used for cable leakage detection and cable leakage detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506779.5U CN203466822U (en) | 2013-08-19 | 2013-08-19 | Circuit used for cable leakage detection and cable leakage detection system |
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| Publication Number | Publication Date |
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| CN203466822U true CN203466822U (en) | 2014-03-05 |
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| CN201320506779.5U Expired - Lifetime CN203466822U (en) | 2013-08-19 | 2013-08-19 | Circuit used for cable leakage detection and cable leakage detection system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104735711A (en) * | 2015-03-26 | 2015-06-24 | 昆山美博中芯投资管理企业（有限合伙） | Novel GSM-R leaky-coaxial-cable detection device |
| CN107204818A (en) * | 2016-03-18 | 2017-09-26 | 上海睿中实业股份公司 | One kind leakage cable real-time monitoring system |
| CN109270409A (en) * | 2018-11-27 | 2019-01-25 | 广州开信通讯系统有限公司 | Leak cable fault point positioning method, device, computer equipment and storage medium |
| CN114325340A (en) * | 2021-12-31 | 2022-04-12 | 南京矽典微系统有限公司 | Test system and test method of radio frequency chip |
-
2013
- 2013-08-19 CN CN201320506779.5U patent/CN203466822U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104735711A (en) * | 2015-03-26 | 2015-06-24 | 昆山美博中芯投资管理企业（有限合伙） | Novel GSM-R leaky-coaxial-cable detection device |
| CN104735711B (en) * | 2015-03-26 | 2018-10-16 | 雷功书 | Novel GSM-R leaks cable detection device |
| CN107204818A (en) * | 2016-03-18 | 2017-09-26 | 上海睿中实业股份公司 | One kind leakage cable real-time monitoring system |
| CN109270409A (en) * | 2018-11-27 | 2019-01-25 | 广州开信通讯系统有限公司 | Leak cable fault point positioning method, device, computer equipment and storage medium |
| CN114325340A (en) * | 2021-12-31 | 2022-04-12 | 南京矽典微系统有限公司 | Test system and test method of radio frequency chip |
| CN114325340B (en) * | 2021-12-31 | 2024-01-19 | 南京矽典微系统有限公司 | Test system and test method of radio frequency chip |
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Granted publication date: 20140305 |